Southwest Airlines is currently in the rollout phase with a high fleet coverage ratio of 86.2%, but as of the latest data, no aircraft are equipped with Starlink and no confirmed observations exist on the TUS->MDW route. The perplexity-verified context confirms zero equipped aircraft as of May 2026, and no recent news or community sightings support higher probability. Given the rollout status and zero equipped aircraft, the probability remains at zero despite the high fleet coverage ratio.